. >>> president obama awarded the medal of honor to an army ranger who served in afghanistan. in 2008 sergeant first class low rye petrie and his team were caught in a fire fight. he was shot in both legs and when a grenade landed next to him, he grabbed it but it exploded blowing off his right hand. his heroic acts saved the lives of two of his comrades. >> whenever you have a chance or opportunity to thank them, shake their hand, give them a pat on the back for the job they've done because they've earned it, that's the greatest reward any service member can get is a simple thank you. >> sergeant petrie is the second living active duty member from iraq or afghanistan to receive the nation's highest military award. >>> we'll have more of sergeant petrie's amazing story coming up on "the early show." i'm betty nguyen. this is the "cbs morning news." ♪ there's another way to minimize litter box odor: purina tidy cats. tidy cats premium line of litters now works harder to help neutralize odors in multiple-cat homes. and our improved formula also helps eliminate dust. so it's ea